JP2012112260A - Engine water pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a bearing and reduce the amount of condensed water coming out of a water drain path by efficiently discharging steam flowing out between a seal member and the bearing out of a pump housing in an engine water pump device while improving the productivity of a water pump.SOLUTION: A concave groove 30 extending in the axis line direction of a rotation shaft 14 is formed, as a steam drain path 24, on the inner circumferential wall 29 of a bearing housing 19 along a bearing 15. The down stream end 30B of the concave groove 30 is open to the leading end 19E of the bearing housing 19 opposite to a pulley.

Description

  The present invention relates to an engine water pump device, and more particularly to an engine water pump device that forms a steam vent passage communicating with the outside.

In an engine mounted on a vehicle, a water pump is attached to circulate engine coolant.
This water pump is provided with a rotating shaft having pulleys and an impeller attached to both ends in the axial direction. The rotating shaft is rotatably supported by a pump housing via a bearing, and a seal member for partitioning the impeller chamber and the bearing chamber is provided. A space is formed between the bearing and the seal member, which is located at the boundary between the flange portion and the bearing housing portion and into which water vapor generated at the contact portion between the seal member and the rotating shaft flows. Some form a steam vent passage that communicates with the.

Japanese Utility Model Publication No. 5-58831 JP 2002-115546 A

The water pump according to Patent Document 1 has a structure including a mechanical seal that biases the sealing toward the seal plate of the impeller, and the steam vent passage extends from the space portion to the atmosphere in a substantially vertical direction and opens to the top. Is.
The water pump according to Patent Document 2 has a structure in which a steam vent passage and a water drain passage are provided in a pump housing provided with a seal material, and a rib is provided above the steam vent passage so that foreign matter does not enter the steam vent passage. The downstream end portion of the steam release passage is opened above the bearing housing portion.

However, in the above-mentioned Patent Document 1, it is necessary to drill and form the steam vent passage, the steam vent passage cannot be bent and curved, and there is a limitation on the formation of the steam vent passage.
In addition, the downstream end of the steam release passage is separated from the pulley and the rotation shaft, and the water vapor generated in the space portion is actively discharged to the atmosphere by using the rotation of the pulley and the rotation shaft. There was no effect to improve ventilation performance.
Therefore, when a certain amount of time has passed and the cooling water has accumulated in the water pump reservoir more than a certain amount, the condensed water leaks from the reservoir and is exhausted to the atmosphere (external), and the water pump leaks. There was an inconvenience of giving false recognition that it occurred.
Also, with such a structure, the hot air from the bearing cannot be efficiently released to the atmosphere, and the durability of the bearing may be reduced.

In Patent Document 2 described above, in order to form the steam vent passage, it is necessary to provide drilling in the axial direction and the vertical direction of the rotary shaft, and the steam vent passage cannot be formed freely curved, There were restrictions on the formation of the extraction passage.
In addition, the downstream end of the steam vent passage is separated from the rotating shaft in the vertical direction, and away from the pulley or the pulley seat in the axial direction of the rotating shaft, and the air flow generated around the rotating shaft by the rotation of the pulley seat is used. Thus, there is no effect of improving the ventilation performance in the space by positively discharging the water vapor generated in the space to the atmosphere.
Therefore, if a certain amount of time passes and the cooling water is stored in the water pump reservoir more than a certain amount, coagulated water leaks from the reservoir and is exhausted to the atmosphere (outside), causing water leakage from the water pump. There was an inconvenience of giving false recognition.
Also, with such a structure, the hot air from the bearing cannot be efficiently released to the atmosphere, and the durability of the bearing may be reduced.

  Therefore, the object of the present invention is to improve the durability of the bearing while improving the productivity of the water pump, and efficiently discharge the water vapor flowing between the seal member and the bearing to the outside of the pump housing, An object of the present invention is to provide a water pump device for an engine that reduces the amount of condensed water coming out of a drain passage.

  The present invention provides a rotating shaft having pulleys and an impeller attached to both ends in the axial direction. The rotating shaft is rotatably supported by a pump housing via a bearing. The pump housing is joined to an engine body and A flange portion that closes the impeller chamber in which the impeller is disposed; and a bearing housing portion that forms the bearing chamber in which the bearing is disposed; A space portion, which is disposed at a boundary with the housing portion and into which water vapor generated at a contact portion between the seal member and the rotating shaft flows, is formed between the bearing and the seal member, and the space portion is formed in the pump housing. In the engine water pump device having a steam vent passage communicating with the outside, the steam vent As a path, a concave groove extending in the axial direction of the rotary shaft is formed along the bearing in the inner peripheral wall of the bearing housing portion, and a downstream end portion of the concave groove is opposed to the pulley. It is characterized by being opened.

  The water pump device for an engine according to the present invention improves the durability of the bearing while improving the productivity of the water pump, and efficiently discharges water vapor flowing between the seal member and the bearing to the outside of the pump housing. Thus, the amount of condensed water that comes out of the drainage passage can be reduced.

FIG. 1 is a rear view of an engine mounted horizontally on a vehicle. (Example) FIG. 2 is a right side view of the engine. (Example) FIG. 3 is a plan view of the water pump. (Example) FIG. 4 is a right side view of the water pump. (Example) FIG. 5 is a perspective view of the pump housing. (Example) 6 is a cross-sectional view of the water pump taken along line VI-VI in FIG. (Example) FIG. 7 is a right side view of the water pump. (Modification) 8 is a cross-sectional view of the water pump taken along line VIII-VIII in FIG. (Modification)

  This invention improves the durability of the bearing while improving the productivity of the water pump, and also efficiently discharges the water vapor flowing between the seal member and the bearing to the outside of the pump housing. The purpose of reducing the amount of condensed water exiting is to form a groove extending in the axial direction of the rotating shaft along the bearing on the inner peripheral wall of the bearing housing portion as a steam vent passage, and the downstream end of this groove is the pulley This is realized by opening at the tip of the bearing housing portion facing the.

1 to 6 show an embodiment of the present invention.
1 and 2, reference numeral 1 denotes a multi-cylinder (four-cylinder) engine mounted on a vehicle, and 2 denotes an engine body. The engine 1 is arranged horizontally with the output shaft directed in the vehicle width direction Y, which is a direction orthogonal to the vehicle longitudinal direction X.
The engine body 2 is formed by integrating a cylinder block 3 and a cylinder head 4 and is provided with a timing chain cover 5 on the right end surface. A crankshaft 6 as an output shaft is supported on the cylinder block 3 on the lower side. A cylinder head cover 7 is placed on the upper surface of the cylinder head 4.

A water pump 9 constituting a water pump device 8 is attached to the cylinder block 3 of the engine body 2 at a substantially central portion in the vertical direction on the rear side of the vehicle. The water pump 9 is connected to a radiator outlet pipe 10 that guides cooling water from the radiator (indicated by a one-dot chain line arrow in FIG. 1).
The water pump 9 includes a pump housing 11 attached to the right end surface of the cylinder block 3. As shown in FIG. 3, a rotary shaft 14 having pulleys 12 and impellers 13 attached to both ends in the axial direction is rotatably supported by the pump housing 11 via bearings 15.
The pump housing 11 is joined to the engine main body 2 and closes the impeller chamber 16 where the impeller 13 is disposed, and as shown in FIG. And a bearing housing portion 19 which forms a bearing chamber 18 penetrating therethrough. A plurality of mounting bolt holes 20 are formed in the peripheral portion of the pump housing 11.

As shown in FIG. 6, a seal member 21 that partitions the impeller chamber 16 and the bearing chamber 18 on the rotating shaft 14 is disposed at the boundary between the flange portion 17 and the bearing housing portion 19.
A space 23 into which water vapor generated at the contact portion 22 between the seal member 21 and the rotating shaft 14 flows is formed between the bearing 15 and the seal member 21.
Further, the pump housing 11 is formed with a steam vent passage 24 that communicates the space 23 with the outside.
Furthermore, the pump housing 11 is connected to the drain passage 25 at the bearing housing portion 19 below the rotating shaft 14 and communicates with the space portion 23 and extends obliquely downward to the right. A water reservoir 26 extending in the axial direction X of the rotating shaft 14 is formed. The water storage part 26 is closed by a plug 27 attached to the right wall of the bearing housing part 19 and discharges the water stored from the upper side of the plug 27 to the outside.
Further, as shown in FIG. 3, a pulley sheet 28 that holds the pulley 12 is attached to the tip of the rotating shaft 14.

In this embodiment, as shown in FIGS. 3 to 6, a concave groove 30 extending in the axial direction X of the rotary shaft 14 along the bearing 15 is formed in the inner wall 29 of the bearing housing portion 19 as the steam release passage 24. Then, the upstream end 30A of the concave groove 30 is communicated with the space portion 23, and the downstream end 30B of the concave groove 30 is opposed to the pulley 12 or the pulley seat 28 and is opened to the distal end portion 19E of the bearing housing portion 19. I am letting.
As shown in FIG. 6, a radiator outlet pipe 10 is connected to the water pump 9 on the side of the invera chamber 16.

In such a structure, as shown in the above cited references 1 and 2, the steam vent passage is more than the one where the interior of the pump housing is linearly penetrated from the space of the pump housing to the outside. Drilling to form the passage 24 is not necessary. Further, since the steam vent passage 24 is configured by the concave groove 30 in the inner peripheral wall 29 of the bearing housing portion 19, the steam vent passage 24 can be freely bent and curved, and the degree of freedom in designing the steam vent passage 24 can be increased. Can be improved. Thereby, the productivity of the water pump 9 can be improved.
Further, since the steam release passage 24 is formed along the bearing 15 in the inner peripheral wall 29 of the bearing housing portion 19, the flow of water vapor and air (or outside air) is caused to flow on the outer peripheral surface of the bearing 15 through the steam release passage 24. Can be formed. Thereby, the ventilation property in the outer peripheral surface of the bearing 15 can be improved, an excessive temperature rise of the bearing 15 can be prevented, and the durability and life of the bearing 15 can be improved.
Further, the steam vent passage 24 is formed in the inner peripheral wall 29 of the bearing housing portion 19, and the downstream end portion 30 </ b> B of the concave groove 30 is opened at the tip end portion 19 </ b> E of the bearing housing portion 19 facing the pulley 12. The downstream end 30B of the recessed groove 30 serving as the downstream end of the steam release passage 24 in the axial direction X of the shaft 14 can be brought closest to the pulley 12 or the pulley seat 28, and is orthogonal to the axial direction X of the rotating shaft 14. The downstream end 30 </ b> B of the concave groove 30 as the downstream end of the steam release passage 24 can be brought closest to the rotating shaft 14 in the direction. Thereby, the downstream end 30B of the groove 30 can be exposed to the airflow generated around the rotation shaft 14 by the rotation of the pulley sheet 28 (indicated by the rotation R in FIGS. 3 and 6), and passes through the groove 30. The water vapor can be pulled to the outside by the air flow, and the water vapor flowing out between the seal member 21 and the bearing 15 can be efficiently discharged to the outside (or in the atmosphere) of the water pump 9 and condensed from the water drain passage 25. The amount of water can be reduced.

In addition, as shown in FIG. 6, the concave groove 30 constituting the steam release passage 24 has the downstream end 30 </ b> B disposed at a position higher in the vertical direction than the upstream end 30 </ b> A, and the downstream end 30 </ b> B is disposed at the upstream end. It arrange | positions behind the rotation direction of the rotating shaft 14 rather than 30A.
With such a structure, the groove 30 can be inclined so that the water vapor rises from the upstream end 30A toward the downstream end 30B, and the water vapor can be discharged from the space 23 to the outside.
Further, the downstream end 30B of the concave groove 30 is arranged on the rear side in the rotation direction R of the rotary shaft 14 with respect to the upstream end 30A, so that the concave groove 30 is formed on the outer peripheral surface of the bearing 15 from the upstream end 30A to the downstream end. A curve matching the rotational direction of the pulley sheet 28 or the pulley 12 can be formed over the portion 30B. Therefore, it is possible to prevent the water vapor that has passed through the concave groove 30 from flowing from the concave groove 30 to the outside in substantially the same direction as the air flow accompanying the rotation of the pulley sheet 28 or the pulley 12 and backflowing into the concave groove 30.
Therefore, the water vapor discharged from the downstream end 30B of the concave groove 30 to the outside is not disturbed around the downstream end 30B, but is pulled by the air flow accompanying the rotation of the pulley seat 28 or the pulley 12, and smoothly flows to the outside. Can be discharged.

Further, in this embodiment, as shown in FIG. 6, an outside air introduction passage 31 is formed in the bearing housing portion 19. The outside air introduction passage 31 has an upstream end portion 12A facing the pulley seat 28 and formed at the tip end portion 19E of the bearing housing portion 19, and extends in the axial direction on the rotating shaft 14 side above the plug 27, and a downstream end portion. 31B opens to the water storage section 26, introduces outside air, and supplies the outside air to the space section 23 side through the water storage section 26 and the drainage passage 25.
Accordingly, the upstream end portion 31A of the outside air introduction passage 31 and the downstream end portion 30B of the recessed groove 30 which is the downstream end portion of the steam escape passage 24 are disposed in the vicinity of the pulley seat 28, and accordingly the rotation of the pulley 12 occurs. The negative pressure is reduced by the air flow (air flow). Therefore, the air, water vapor, or hot air that flows through the outside air introduction passage 31 or the steam escape passage 24 is subjected to a force that is pulled to the outside by the rotation of the pulley seat 28 or the pulley 12.
Since the outside air introduction passage 31 is disposed outside in the radial direction of the rotary shaft 14, the outside air introduction passage 31 that communicates the outside and the water storage portion 26 at the upper portion of the plug 27 has a negative pressure compared to the downstream end portion 31B. Becomes larger.
Accordingly, air (outside air) is easily introduced into the outside air introduction passage 31 that connects the outside and the water storage portion 26 at the upper portion of the plug 27, and this air is passed through the water passage 26 through the water drain passage 25. 23 is smoothly introduced.

7 and 8 show a modification of the present invention.
In this modification, a communication path 32 made of a groove extending in the axial direction X (parallel to the bearing 15) of the rotary shaft 14 along the bearing 15 is formed in the bottom 29 </ b> A of the inner peripheral wall 29 of the bearing housing portion 19. The communication passage 32 has an upstream end portion 32 </ b> A communicating with the drainage passage 25, extending in the axial direction X of the rotary shaft 14, and a downstream end portion 32 </ b> B facing the pulley seat 28.
Thereby, the quantity of the air which flows along the outer peripheral surface of the bearing 15 can be increased, and the ventilation property of the bearing 15 can be improved. And the excessive overheating of the bearing 15 can be prevented.

  The water pump device according to the present invention can be applied to various engines.

DESCRIPTION OF SYMBOLS 1 Engine 2 Engine main body 3 Cylinder block 8 Water pump apparatus 9 Water pump 11 Pump housing 12 Pulley 13 Impeller 14 Rotating shaft 15 Bearing 16 Impeller chamber 17 Flange portion 18 Bearing chamber 19 Bearing housing portion 21 Seal member 22 Contact portion 23 Space portion 24 Steam vent passage 25 Water drain passage 26 Water reservoir 27 Plug 28 Pulley seat 29 Inner peripheral wall 30 Concave groove 31 Outside air introduction passage 32 Communication passage

Claims (3)

  A rotary shaft having pulleys and an impeller attached to both ends in the axial direction is provided. The rotary shaft is rotatably supported by a pump housing via a bearing. The pump housing is joined to the engine body and the impeller is disposed. A flange portion that closes the impeller chamber, and a bearing housing portion that forms a bearing chamber in which the bearing is disposed. A space portion is formed between the bearing and the seal member, and a space portion into which water vapor generated at a contact portion between the seal member and the rotary shaft flows is formed between the bearing and the seal member. In the engine water pump device in which a communicating steam vent passage is formed, as the steam vent passage, A concave groove extending in the axial direction of the rotating shaft is formed along the bearing on the inner peripheral wall of the bearing housing portion, and a downstream end portion of the concave groove is opened at a tip portion of the bearing housing portion facing the pulley. An engine water pump device characterized by that.   The concave groove is characterized in that the downstream end is arranged at a position higher in the vertical direction than the upstream end, and the downstream end is arranged behind the upstream end in the rotation direction of the rotating shaft. The water pump device for an engine according to claim 1.   3. A water pump device for an engine according to claim 2, wherein a communication passage made of a concave groove extending in the axial direction of the rotary shaft is formed along the bearing at a bottom portion of the inner peripheral wall of the bearing housing portion. .

Images